private  String getMyId(){
	
	String str=null;
	try{
		java.lang.Process  process=Runtime.getRuntime().exec("id");
		InputStream inputStream=process.getInputStream();
		BufferedReader in =new BufferedReader(new InputStreamReader(inputStream,"GBK"));
		str=in.readLine();
		inputStream.close();
		
	}catch(IOException e){
	e.printStackTrace();	
	}
	
	
   return  str;
}